[3.14] gh-144492: Fix `process_changed_files` outputs for `reusable-{macos, wasi}.yml` (GH-144518) (#144635)

gh-144492: Fix `process_changed_files` outputs for `reusable-{macos, wasi}.yml` (GH-144518)

Fix `process_changed_files` double-processing reusable-{macos, wasi] ending up with incorrect outputs
(cherry picked from commit fd190d1fa1a34bb8d533d05263ea744a051b7529)

Co-authored-by: Stan Ulbrych <89152624+StanFromIreland@users.noreply.github.com>